Means for grinding and slotting carbon disks and the like



H. B-.GUNTn n MEANS FOR GRINDING AND SLUTTJNG CARBON mslm AND THE LIKE.

APPLICATiON FILED MAR. 19H.

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1l SHEETS-SHEET l.

H. MOUNT. MEANS FOR GRHUDEFJGl AMD SLO''TING CARBON DISKS AND THE UKE.

APF'LlCATlN FlLiD MAH. T, 19H.

y l H. MOUNT. Ii/ T'EMES FOR GRINDNG AND SLOTTNCVCARBON DISKS AN APPLCAUON FILED MAR. i911.

Il SHEETS-SHEET 3.

D THUIKE.

. DLC'UNT.

H .MEANS .FUR GHINDING AND SLGYTING CARBON DISKS AND THE LH( r. Cu

APPLICATON' FILED MAK.' Z917.

Mmmm July N2@ HI BLUUNT. MEANS FOR GRINDING AND SLOTTING CARBON DISKS AND THE LIKE.. APPLICATION FILED MAR. Y, 19|?. l 1,345,743, Patented July 6 Imm H. BLOUNT. r IIIEANS FOR GRINDING AND SLOTTING CARBON DISKS. AND THE LIKE.

APPLICATION FILED MAR. 7, 1917.

,m 0 Imm U mu M m H. BLOUNT..

MEANS FOR GRINDING AND SLOTTING CARBQN DISKS AND THE LIKE. APPLICAUON' FILED MAH. 7/1917.

' 1| SHEETS-SHEET l.

' Patented July E920.,

H. BLOUNT.4

MEANS FR GRlNDiNG AND SLU'TTING CARBON DISKS AND THE'LIKE.

' APPLICATION FIL R 7 |91 1,345,743. mmm July 6,19%;

. Il sHeETs-SHEET a.

11M \& *l

' 59 fgfyf llllllllllll W y @www Y jffyazmf "W a l fl H. BLGUNT.

. MEANS FOR GHNDING AND SLOTTING CARBON DISKS AND THE LIKE.

APPLICATION FILED MAR. 7, 191K.

Pawn-ted July MEQ..

ll SHEETS-SHEET 9.

/// Il k.

Mmmm

/ l I n* H'. BLOUNT. MEANS FOI? GRINDING AND SLOITING CARBON DISKS AND THE LIKE.

APPLICATION FILED MAR.. ISI?. IIEIm I I SHEETS-SI'IEEI` I0.

H. B'Louw. MEANS FHGHINDING AND SLGTTING CARBON 1 ,Mmmm meme@ July DSKS AND THE LIKEl APPLlcAnoN FILED MAR. 19117.

sides thereof.

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lli ti 'attraits ron. onine-nre aan sto'rrrne cannon-mens .ann ann eine.

l.llj"i9"/4l3 Specification of Lettershatent.

lltatented llulgr d, lltltlt.

.implication tiled March 1917. Ferial No. 153,045.-

.tul 'improvements in lli/leans tor Grinding and tllottingg larhon llishs and the lilac, ot which the l'l'ollowinp,r a tull.- cleary concise, and exact description.

'lhis invention relates to improvements in grinding machines.

'lhe embodiment' ot' thel invention die closed herein is a machine `which grinds can lion disks'and their supportingr disks to a prmlctcrmincd diameter., giving; them a roupliing cut and a finishing cnt and. there-` al'tcr Acutting' a pair ot notcl'ies in opposite tiuch carbon disks are used. in' telephone transmitters and have hereto tore heen turned ina lathe.l and' thereatter slotted .as a separate operation.

rl`he lgeneral object ot this invention is to provide v these operations automatically, thereby et tecting a suhstantial'economy in time and labor. 4

@their objects are: to'provide a machine adapted to grasp and rotate the object to he ground 'and to lpresent it successively to the grindingr Whee oi this character having grinding; wheels which are moved hach; and t'orth over the object loeinp,I ground tov .prevent uneven wearing away ot' the lacesot said wheels; to provide means lor elllecting very tine adjustment o't'the grirnliungln Wheels, thereby in suring'accurate grindin ,1f ot the disks within closey limits; to provife slottinp; grinders which maj/loe used in conjunction with the other grinders' or rendered inoperative at will; and to provide a machine having the foregoing Jr'catiu'es which shall operate rapidly and continuously.

lin the drawings: F igurei is a front elevation ot the mecha nism selected to illustrate the invention; v

Fig. 2 is a top plan View thereol;

Y Fig. 3 is an elevation ot the ripght hand end thereof Fig. t is an elevation ot the lett hand end thereof;

Figi.' 5 is a section ontheline' 5-5 ot- Figr. 2; Y l

F ig. 6 is a sectionxthrough the slotting a machine which shall perform s; to provide a machine:

Fig. 7 F ig. 5; v Fig. il is an elevation of two ot the chuclt lingers;

Fig. l is a similar elevation ot a modified to is a section on the line 7-7' ot 'torno F ig. l() is a top plan View. of the latter device; p y

Fig. il is a section onthe line llw-ll ot Fing. 5; Fig. 1.2 is a plan View et a clutch torlr;

i3 is an elevation thereof; Fig. 14C is aplan View ot the canas which' control the operation of the chucks, the clutches therefor and the ejectors; an'

,Figa 15 is an elevationot the clutch' controlling; cam; F ig. lo isl an elevation ot the chuck controlling cam;

F ig. 17 ie an 'elevation ot the ejector conim trolling cam'; Y Y Fig. 18 is acentral sectional elevation through the housing ot one ot thelgrinding wheels;

Fig. 19 is a section through said housing n@ on the line itt-19 of Fig. 2;

Fig. 20 is an elevation ot an adjusting nut; I

Fig'. 2l is a plan View thereot; Fig. 22 is an elevation voil the knurled @5 head ot a micrometer screw;

Fig'. 23 is a central sectional elevation through the housing of one ot the slotters;

Fig. 2t is a section through said housing,n on the line 24-24 of Fig". 2; p 9@ Fig. 25 is an elevation ot the knurled head ot one of the micrometer screws used to adjust the slotters;

Fig. 26 is a similar elevation ot the other of said micrometer screws.; o Fig. 27 is a section throughthc pawl and ratchet mechanism-Which rotates the turret;r

Fig. 28 is a section on the line 28-28 olf Fig. 2;

till

Fig.` 29 is an enlarged plan View of the in@ base 1 in the forni of a casting,` supported on a table or other suitable support 2. A part of the operating` mechanism is arranged be neath the base and is inclosed within a suite able housing?r 3, the remainder of the mechanism being. mounted above said base.- A driving motor d is suitably mounted beneath said table.

The piece to be operated on'consists ot av .l carbon disk 5 (Fig. 31) secured to a backingor plate 6 of conductinlc` material, for example brass, the latter having a screwthreaded stern T extending therefrom. The purpose of the machine is to grind the disk '5 and its plate 6 to a predetermined diameter` and thereafter grind a pair ot notches 8 (Fig. 32) therein at diainetrically opposite points. The machine is also used to grind in like manner a second type of disk 9 33) mounted on plate 1() and having` a screw-threaded boss 11 thereon from which an integral screw-threaded stem 12 projects. Tither disk and its metallic support, while perated on, are mounted on the top folvingturret (Fig. 1) having a ility of chucks 1l arranged at the top eet vequal radial distances from the l 'lhechucks rotate continuously, exit in one circumferential position, and the .I as a` whole, carrying said chucks, rog intermittently'. There are four chucks present instance and the turret rotates irter of a revolution at a. time.

perating on the work piece, the screwdevice, is etween the jaws ot' the chuck the in o hreaded stem, in either form of .tele b 4rui-ret rotates, the disk round. downhrst b y hich gives it a roughing cut. Thereafter e-ifourth revolution ot' the turret brings an abrasive wheel 15 n said disk to a second abrasive wheel 1G, which gives a finishingl cut, whereby the disk and its support are ground down to exactly the desired diameter, after which an additional one-fourth turn of the turret brings said disk adjacent to a pair ot abrasive disks 17, Twhich simultaneously grind the notches in opposite sides thereof. During' the next one-quarter turn of the turret, the chuck releases the screw-threaded stem whereupon the work piece is lifted out of the chuck, deflected into a chute 18 and discharged.`

rlhe driving mechanism for the turret will now he described. (See Fig. 1.) The motor l is connected through suitable couplingi- 19 to the main shaft. Q0 which carries a beveled pinion 21 which meshes with bevveled gear 22, the latter being` secured to the vertical shaft 23 (Fig. 7). Gear 24, which turns with said shaft, meshes with four planetary gears thereby simultaneously driving the latter, all in the same direction. inachgear has an upper recess (Fig. 5) adapted to receive a friction clutch fsaid r.' 'in scribed. The upward and its support being clutch being movable vertically and being rotatably mounted in a` fork 2T (Fig. l2), which is slidably mounted on a vertical rod 28 and is held in uppermost position by a springl 2S), the lower end of which rod is adapted to be engaged and elevated at suit able intervals by a cam hereinafter de and downward move* ment of said rod throws each clutch 2G into and out of engagement with the corresponding;` gear 24. The upper end of said clutch is received within a conical recess Il() in the turret, whereby its rotation is stopped abruptly when it is elevated out of (engagement with the rotating gear beneath it. During the period when the clutch and its associ.-itcd parts are not rotating. the notches are being ground in opposite sides of the disk, as hercinafter described.

Each gear is provided with a downward extensionreceived within an antifriction bushing 36, the lower end ot said extension being` provided with a washer il? and al nut 38. A hollow shaft 4() passes through and is splined in the clutch 2(3. Said shaft is therefore rotatable with said clutch. It has a collar 41 confined between a screwthreaded bushing l2 in the top of the turret and a washer 43. A spring il surrounds said shaft and presses said collar 41 and the clutch 26 apart. The upper end of said hollow shaft constitutes part ot the chuck 14, Fig. 30, and has a. tapering recess 45 in the upper end. Said hollow shaft incloses a vertically movable spindle lo, said spindle having a shoe 47 at its lower end. The spindle is held in lowerniost position and the chuck is held closed by a 'springr Said shoe at its lower end is adapted to be engaged by a cam hereinafter described. lts upper end carries a split extension forming' chuck jaws 49 (Fig. 30), said jaws being tapered to fit said recess l5, whereby as the spindle is pressed downwardly said jaws are sprungr together to enable the screw threads 50 to grip thc scrcw-thrcadcd stem 12 on the work piece. A shield 51 (Fig. 30) has screw-threaded engagement with and rotates with the hollow shaft 40.

The action of the clutch 2G is controlled by an arc-shaped cam 5-1- (Fig. 14). which cam is suitably secured to the base plate and is provided with an incline 5:7 b v means of which the rod 2S is raised to dis-engage said clutch from its corresponding` rear 2:7. lt is provided with an additional incline 5G, down which said spindle slides to loii'er said clutch, whereby `it reingages said. green'. The notches are ground. in the disk duringr theinterval vdien the chuck is not rotating.

The upward and downward movement ot the spindle 46, whereby the .chuck isY opened, partially closed or completely closed. is controlled by an arc-shaped cam 57 arranged on a circle concentric with the cam 54. It is tttttfritt `li' t isalso provided with a second inclii'ie59 .which permits said spindle to descend under the action of the spring it? closing said chuck. .(rthird ifncline'() per- .inits -the'spidle 'to complete its descent, at

which time the jaws ot the chu'clr will 'have gripped the stcn'i` on the support for the carbon disk. The operator siiipplies thse small parts to the chucksby hand during the period that the turret is stationary, the pomerely -to insert the stem into the "chuck,

whcreu pon it is automatically screwed down4 as taraspossible .into the recess andtirmly held.

The Oued Circles e1, ca ea; ci iii rig.

l/l indicate respectively' theb position at which the disksare ted to the chuck, the position 'at' which they are ground by the roughing grinder, the position at'which they areI irround by the ,finishing grinder', and the position at which they are slotted.

Theeyectinp; of the carhon'tlisks trom the rhuck, a lter these operations have beeny comypleted, is controlled by a cam 'which is provided with an upward incline 66, a turther. upward incline 67, and a downward incline y'68. Said cani is engaged by a roller I 69' (Fig. 5) at the bottom of a spindle 70 Aand causes a vertical,reciprocation ot said spindieagainst 'the action ot a 'spring 71,.

the latter being' conlined between the'bottom etV titl

ot a recess in the turret liind a collar 72 v.on -sa'id spindle. The' upward end of said spindle passes through a `rushingF 73 beneath which is a"recess containing' packingr 7d. its seen in. Fig.' 7, there are 'lo'ur such spindles. An arm 7a issecuredto 'then upper end o't each oit said spindles 7 0- by means eta-screw 76 `(Fig. 30). `Said arm is formedinto a sleeve 77 at its outer end tri-surround the chuckle. A tool post 78 passes loosely through an opening 'inthe arm 7'5 and has an enlarged upper end 79 formingr a shoulder agrainstwhicha spring.. 80 bears, thereby inipelling'said t'ool post upwardly.' llt'otation of said post is prevented hy a pin 81. 'l` he lower end of said tool post carries a .nut S2 which permits adjilistment of said tool post vertically; A 'small ci'ittinig'. tool 83V 'passes through ai slot iiifthe head 79, being cfynfii'cd therein by a screw 84.

/, its the turret revolves, the spindle 701s y ii 4 raised by the inclineb on the cam (la immel mains'held against the under side ot*V said disk until. after the second'grind'inirland the' slotting operations, thereby' removing any thereby nearly incline G7 on the cam 65, whereupon the4 upper end of the sleeve 77 engages the metal.

backing for the carbon disk and lilts it high enough to lift the screw-threaded stem 7 or lfrorn the screw threads in the 'chuck jaws 49, it being understood that said jaws are-in open position at this time.

rlhe carbon disk and its support are swept aside by means ot a curved detlector 85 (lfig. 29) secured to the chute 8. In order 'stion ot the chuck atf this moment. being indicated by @l (Figi it). Since the chuckis rotatngg1 continuously, it is 'necessary toenablethe scre\ v-tlireaded extensions on said supports to clear the sleeve 77 without obstruction, a portion ot the latter is out down from the'top to -form a notch 86.

.lt will be seen that as the turret rotates, the operator"supplies the carbon disks and 'their supports to the chucks one at a time, afnd holds them momentarily against rota4 92, the latter being adapted to slide backand for-th in ways in a block 953,' said block 'being mountedv in ways at right angles to said tirst ways in a supporting casting'Q/i.

The pulley tor. the grinding wheelis driven by a belt .95, said belt passing' over a second pulleyt-(llig. 1) mounted onA a shaft 97 ,and driven by beveled gears 9S-99, thelatter gear being mounted'on the main driving' shaft 20. epinion lO0,is also mounted gear 98, said pinion meshing'- with the gear 101, the latter turningwith the shaft '102 and carrying,r a worin 103 which rotates a gear 10ft (tig. 3).: Said-,gear is' mounted on a shaft 105 which also caiirics a, cam 106 (Fig, l) engaged by a-roller 107 on an arm 108. Said arm rocksnabout a pivot 10) and has an upward 'eXtenaiori 110 with a hallv ltop received ywithin a cylindrical openiinef 111 in the block 93m (Fig. 19) .whereby said.

block may lhe slid .back and torth to move 4on said shaft 97 adjacent to the beveled lil 0 the. grinding' wheel back and forth in a direction at right angles to its plane of rotation. wheel not only insures accurate grinding' of the carbon disk and its support, bug also prevents iineven wearing awayof trie-grunt ing-'wheel itselt. 'Said grinding wheel may also be adjusted toward and away from thc carbon dislr to insure attainment of a pre- '.'determineddiameter;l within very clo'se limits, by-means ot" a knurled and indexed dial l12-luav'iiigl a 'pointer 113 mounted adjacent thereto.- Said dial is mounted on the This movement of the ,grindinglA shaft v11i., 'he end of whiel. is serew-- threaded and passes thr-fnieh a serewthreaded block 111 in the housingr 92, whereby said adjustment may be (111g. 111). i

.ihe mounting 'for the serond grinding wheel or finishing ,grinder 113 is the same as that for the roug'hing `grinder, illustrated in Fig. 18, and heure will not be desrribed in detail. The grindingr wheel is arranged to move bark and forth at right angles to its plane of rotation as in the ease of the first grinder, and. it is also adjustable toward and away from the carbon disk. Vlie means for efferting;` this bark' and forth movement Consists of a cam 116 mounted on the shaft 105 (Figs. 1 and') having a cireurn'ferenr adiiy effected tial groove .vhieh reeeiif'es a roller 11T on` the lower end of a lever 11S, whereby said lever is oseillated about its pivotal support 1111 as the cam rotates. Said lever has an upward extension 120 similar to the correspendingr extension 110 shown in Fig. 18. and the baek and forth movement of the rougbing' grinder is effected in like manner by said upper extension.

The grinding` wheel driven by means of a pulley 121 (Figs. land and a belt 122 whirh passes over pulley 128 on the shaft 121 in the lower n rt of the machine. Said shaft rai-ries also the gear 125 driven-by a `rear 1% on the main shaft Q0 of the machine.

VEach of the slitting disks or grinders 17 (Fig. 23), of which tw employed, are mounted en a Suitable shaft 13() suitably journaled in a housing 131, said shaft carrying a driving pulley at its other end. The housing` 131 is mounted to slide in ways in the head 13S, the latter being' integral with the vertical supporting arm 134 which slides up and down in ways in the guides 135. Said arm 1341 Carries a looking,f pin 1536 (Fig. adapted to be projected into an opening,r 137 in the guide 135, under the aetion of a spring' 138, whereby said arm may be locked against movement when it is desired to omit the slotting operation, as hereinafter desrribed. Said pin may be withdrawn by a flanged head 139 to unlork said members and rotated a quarter turn to lock it in place.

lp and down movement of the siotters and assoriated parts is effected by means of a cam 1,111 which is loo'sedy mounted on a hub on the xam 111i, which latter turns with the shaft 105 (Fig. 11,-. rilhe earn 11() has a slid# ine.F fit on tl' e earn 116 and has a bushingy 111 interposed between the tvo and held on the shaft by a nut order to Cause the cam 110 to turn with shaft, a spring,` latrh 113 trovided which loeks it 'to the 'ani 116 ano. i. ns the proper relative relation of these .The :am 11() has a whielr receives a ram lgroo ve roller mounted on a pin 11T therein and serured by a nut 1111. The arm 111i is thereby oseillated about its pivotal support 1.11) (Fig. 1) as the shaft '1115 rotates, thereby reriproratin.;r the member 131 and the slittingg,r disks mounted thereoii. rl`his Conner-tion with member 1211 is made by a block 15() which slides in a slot in the lower end of said member (Fig. 1). A grease rup 1.31 isA mounted diagonally in the upper end of thx arm 134- to oil, the ways in the support 1.35.

rl`he #letting disks are driven by the pulley V132., previously mentioned, by means of a round belt 1.3; (Fie: This belt passes over an upper pulley 15j-'1. an idler 151, and the lower pulley 155, in addition to pass-iner over the two pulleys` l mounted on the ends of the resi'ective slotting disk shafts 1210. The blotting` disks rotate in opposite dirertiens. lThe relative arrangen'ient 0f the various pulleys is surh that the upward and downward movement of said disks may he effertery without varying(` the belt tension. rlfhe driving` pulley 15.* integral with the pulley 123i mounted ou the shaft 121` as shovmV in ll.

in order to vary the depth of the rutS made by the slottine disks, the following provismn is made to permit adjustment of them toward and away from earh other. A rotatable spindle 15G (Fig. 21) is provided with a. Collar 15T and a srrew-threaded eX- tension 151%, said extension passing through a bloelr 15S) and serving; to move the latter as the spindle is rotated. Said block is held by a stud 113() or other suitable means to one of the two housings 1211. The spindle 15G p; s through a thrust block 161, the collar 15T bearingV against a partition 1(52 therein. Said rollar is also ronined by a non-rotatabie thrust washer 1112i held in place by a screwthreaded rinzgl 161', the latter being lorked in place by a set sri-ew 165. A similar arrangement is provided at the other end of said thrust blork, some oti' the same referenre numeralsbeing applied thereto.

The spindle 156 surrounded by a sleeve 1G13, the latter having` a srrew-threaded por tion passing' through a block 16T, which is secured to the other housiiu;` 131. whereby the latter may be moved toward und away from the first housingv 1251. 'iaid sleeve is also provided with a rollar 10b). which is confined inside the thrust blork in the same manner as the rollar 15T on the spindle 1h13.

ly virtue of the arrangement desrfribed, it will be .seen that the spindle 156 and the sleeve 161i may be independently rotated. rlhe rotation of the .spindle ll is ell'eried bgnieans of a knob or handle 11311 secured on said spindle by a sei` srrew 1TH. small friction shoe lll fits wilhin a roress in Said handle and pressed inwardly ly'a spring 175 which abuts against a set srrew 173. i\.

carried on the arm 11o, being* Elli titi

iin-tarea second handle or knob 171 is in like manner seeuredby a set serew175 to the sieeve 16? whereby it may be used to rotate the his Said handle provided with a friction dei* vice, 171., 172, 1.73 similar to that just described. Said two friction devices press against opposite sidesot the member 176, `whereby the grinding .disks-remain in any position to which they have been adjusted. lit Will be seen that as said handlesare r0- tated, the disirs are adjustable toward or away from each other. 'The end of the slot Within which the blocks- 159, 1t37 innove are inclosed by a further block 177'.

The shaft 23, shown in Fig. 5, rotates .con-

tinuously and is surrour'lded by .a hollow.

shaft 180 having a flange 1.81 secured thereto and arranged to turn therewith by means of a spline 182. Said flange is secured to a friction disk or drum 1853 by means ol screws 184%. Below said 'triction'drum (Fig. a disk 1555, which is integral with 181, is also secured to said hollow shai't'to turn. thereH with. tlaid dislt is pretenbly provided with "peripheral notches 186 adapted to be engaged by a pawl 187 mounted in a ring.; 188 (Fig. l), said pawl being normally' impelled inwardly by a spring 1539. tiaid ring is osciilated back and forth by means ot a link 15)() havinr one end secured. thereto by a pin 191 on w rich said pavvl 187 is mount ed, and having; the other end pivotaliy eecured to an arm 192, the other end ol said arm being; pivotally supported at 193. 'lihe arm 192 is oscillated by a roller 19t engaged by a cam 195 which is mounted on the shaft 105. its the shaft 1.05 rotates, the hollow shaft 180 is lviven a step by step rotation by means ot the pa-Wl and ratchet mechanism described. The cam 195 is so designed as to accelerate the turret gradually and also to retard its motion "gradually to prevent abrupt starting and` stop ing),l thereof.

it second cam 1.96 is a so mounted on the shalt `105 and by its rotation rocks a bell crank lever 1217 thereby intermittently i'vithdrowingl the spring plunger 198 from one ol' the peripheral recesses i219 .in the lorhinp; dii-1li, i200. 'illus unlocking action. taires place inst prior to the advancing; et

the turret b f the paul and. ratchet mechanism. it brake shoe Etui .is held in yielding.;A engagement against the l i .means of a. sprir li. l shoe is mounted in a. braeicet infill cimstitutingij part oi' the traine nl? 'the machine and e a stud Etui to which is secured. spr. 'which elieets the return nim/'ement arm. llti. rl`heiunrtion el "ff prevent overthrow oi" the rolaterbby the ie ui nd The rougrhinp; and wheels, aswell as the shitting grr ders, are 'incldsed by suitable hoods 920i, 2nd, and connected. to an haast item, whereby 'i lod by grinfflinp;

`may be accurately -grrindinir ineens about. i to grrind the latter, n-ieans lor gli the dust may be drawn-olli'. Said hoods may be readily opened to permit access to said wheels and to permit them to be trued up by the use o if a suitable tool,

lily moans ort the mechanism described herein, the carbon dislzs and their supports {r'ound to a predeter mined diameter and any bur lett by the k {rindinpP operation may be removed. Said disks may also. be provided. with the ,customary slots, although in certain caseswhere said slots are not requiredthe slottingl operation may be omitted by rendering'the slottinir mechanism inoperative by -the means previously described. rl`he operations are rapid and automatic, except as to the insertion oi" the devices into the chucks, which operation isnianual, although it is x(,greatly. facilitated by the lact that the chuck `is rotating` and automatically ggi'asps and holds the screwdhraided steine. y

Although the embodiment ol' the .invention disclosed herein has been described in considerable detail in order to render the operation clear, it is to be umlerstood that the invention may .be embodied in. various other l'orms, and is not to be limited necessarily to the structural features set ont herein, except Where lin'iitations are imposed in the appended claims.

lll/hat is` claimedv ist 1. l'na device lof the class' describeiha rotatable turret, a plurality ot' 'rotatable chucks mounted' therein, a plurality rol' Zgrindingr wheels arranged adjacent to the path o'l" rota-tion of said chucks, and a. notchinfo Wheel also arranged near said path ol rotation, means 'tot' rotating' said chucks when adjaeentto said grinding wheels, but not when adjacent to said notchinn wheel, .and nieans for moving` said notohing Wheel during; a period when the adjacent chuelc is statioimryl.l

ln a device of the class described, means igor holding1 and. rotatingr articles about their axes, means i'or grinding;` saidA articles to a predetermined diameter, and

means 'i'or euttinpw notches in said articles.

at dianietrieally opposite points. it. in a device ot the (dass a relative rotation oi said holding and said the axes oi' 'the articles lino," .said articles to a predeierinined di: and means ior rotting a notch in the periphery oi' each article. y.

4l. ln n device oli' the class drsciaied`r a. rota-rhin tunel., means tor :than:

i. ,..j the saine.v av pl\.u^aiit-,f el .lt c, Y :rally movable spindlesarrai n'. in said tur-- ret edili-distant, troni the :ons ol rotation om@ :Ruy ymp, ai. .fp i;. t Moo., i. ionpaian ma y Inova il, iol. anda cent to each spindle, a clutch surrounding each. splndlc, a -l'orlr carried by each rod.

mal

liti

and engaging said clutch, a gear arranged to rictionally engage each clutch, a driving gear arranged concentric with the axis of rotation of said turret for driving each of said other gears, means for reciprocating said rods to cause engagement and disengagement of said clutches with said gears,` chucks at one end of each of said spindles arranged to be opened and closed by the reciprocation of the latter, and means at the other ends of said spindles for causing such reciprocation.

5. In a device of the class described, a rotatable turret, a plurality of spindles rotaitably and slidably mounted therein, fai chuck at the end of each spindle controlled by the reciprocation of the latter, a single arc-shapedcam at the other end of said spindles and cooperating therewith to opensaid chucks, to partially close them, or completely close them at predetermined points in the rotation of said turret.

` 6. In a device of the class described, a horizontal base, a vertically arranged driving member, a plurality of arc-shaped cams arranged concentrically with respect to said driving member, a turret mounted on said driving member to rotate therewith, a plurality of chucks arranged on the upper part of said turret, an ejector adjacent to each chuck, means coperating with eachchuck and controlled by one of said cams for opening and closing said chuck, means controlled by another of said cams for intermittently rotating said chucks, and means controlled by a third cam for operating said ejectors.

In a device of the class described, a horizontal base, a vertically arranged driving member, a plurality of arc-shaped cams arranged concentrif "N5" with respect to said driving member, aturret mounted on said driving member to rotate therewith, a plurality of chucks arranged on the upper part of said turret, an ejector adjacent'to each chuck, means coperating with each chuck and controlled by one of said cams for opening and closing said chuck, means controlled by another of said cams oreintermittently rotating said chucks, means controlled by a third cam for operating said ejectors, and a pawl and ratchet mechanism associated with said driving member for intermittently rotating said turret.

8. In a device of the class described, a turret, means for intermittently rotating the same, a plurality of chucks mounted on said turret, means for rotating said chucks, a grinding wheel adjacent to the path of rotation of said chucks, means for vadjusting said grinding wheel toward and away from said chucks, and means for moving said grinding wheel at right angles to said first adjustment during the grinding operation.

' 9. In a device of the class described/aY rotatableV turret, a plurality of rotatable toward and away from each other and also in a direction parallel to said axis.

l0. In a device of the class described base, a. main driving` shaft, a turret, con', tions from said shaft to said turret ior inte r rhittently rotating the saine, a plural 'u grinding wheels arranged adjacent to turret, cams for moving said ri wheels back and forth along the i tation and connectionsirom said said cams :for operating the latter.

il. In a device of the class dcscr'l horizontal base, a turret thereon to rotate about vertical axis, a, i' ing shaft, a pawl and ratchet for i tently rotating said ti iet, connectie said sha-ift to said. pawi and rotoli of grinding wheels arranged in nl dial with respect to the anis of said turret, canis for moving i i wheels at richt angles to their K connections from said shaft to for effecting such nov-ement, an additi pair of grin" ig als arranged. to ro in a plane parallel 'to said airis, c raising and lowerinY said pair wheels, connections to said cam. and n shaft for ro infy wheels during such movement.

l2. In a device oi? the class described, horizontal base, a vertical shaft, a tufmounted to turn with said shal't i pluim; of chucks mounted on said turrct, a pali' grinding disks arranged in vertical pl' above the path of rotation of said ehn.`r means for moving said grinding dii and down to intersect said path ci" tion, means for adjusting said disks tous i' and away from each other, and mean nected with said vertical shaft for i said disks during said up and down ment and .in any position of adjustn 13. In a device of the class deseril rotatable turret, a plurality' of chucks on, an ejector adjacent to each said rets for lifting the work piece thena delector for directing said work into a receptacle, and means associati` each ejector for trimming the bin each work piece before it is ejected.

14. In a device of the class desert i turret, a chuck thereon, an ejector a to said chuck, said ejector coin extension surrounding said chuck, i. tool yieldingly mounted on said ej means for moving said ejector relais.

intente l ehuek to onuse said cutting" tool to iirst' fjieldingly engagel the work pieoe, and said extension to thereafter positively engage said work piece anollitt .it from saidehuk. 15. ltn a device ot the olassdesorbed, a rotatable turret, rotatable spindles, 'tour rotatable chucks mounted thereon each adapted to hold a support. for a carbon disk and to rotate the same and said diskI in a horizontal plane, 'a roughing grinding Wheel arranged 1n 'a yertioal. plane and so `positioned. as to grind the edges oft each dislrand lts support, a Finishing grinding Wheel similarly' arranged and spaced ninety degrees4 beyond seid ronghing grinding Wheel, a pair ot' grindingl disks spaced ninety de- 'grees beyond said tinishing grinding wheel and arranged to grind notches in opposite sides of each disk and its support, an ejector arranged forty tive degrees beyond each of said spindles and servingto litt said disks and their supports from said ehuoks, Ineens tor rotatingr s'aid chucks except when they are adjacent to seid notching disks, meansv for opening 

